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本文通过１２例双颌前突患者拨除四个第一双尖牙，用方丝弓矫正器矫正前后牙颌面软硬组织的分析，认为方丝弓矫正器减数 ，在改善牙位及唇倾度的同时，也能改善软组织侧貌及唇的闭合功能，对骨骼作用不明显；唇与切牙的移动密切相关，上唇与上切牙，下唇与下切牙后移量之比分别是１：２．３，１：１．４，并以此作为治疗前软组织侧貌预测的参考。
In this paper, 12 cases of bimaxillary protrusion patients were removed four first bicuspid teeth, orthodontics with square arch orthodontic treatment of dental and maxillofacial soft and hard tissue analysis, that square wire orthodontic reduction in improving the position and Lip inclination, but also can improve soft tissue profile and lip closure function, the role of the skeleton is not obvious; lip and the movement of the incisors is closely related to the upper lip and incisors, lower lip and lower incisors, Is 1: 2.3, 1: 1.4, and as a reference for the prediction of soft tissue profile before treatment.